How to install Android XAPK Games
The XAPK (APK with OBB cache data) file you downloaded.It's very easy to change the xapk extension to rar.
Example: Dead strike 4 zombie.xapk
after being changed to
Example:Dead strike 4 zombie.rar
How to install unknown sources Apps APK file to Android
Out of the box, your Android device only allows you to install apps from Google Play Store. To install software anywhere else, you have to enable installation from third-party sources. That is, enable the “Unknown Sources” setting.
From the Homescreen go to Settings >> More.
Go to Security >> Device administration.
Check "Unknown Sources"
This will enable you to install apps from sources other than the Play Store.
You may need to adjust this according to your Android models. For some users, simply go to Settings -> Security and make sure Unknown Sources is checked. Sometimes you meet the problem of can’t downloading apps.
Do remember to make sure the Unknown sources is checked so you can download apk files other than the Play Store.